The Animal Quarantine Service inspects livestock products contained in passenger’s baggage, international mail, and international courier shipments to prevent the introduction of livestock diseases such as African swine fever.
Please be aware of the following as we approach the Chinese New Year:
1. Do not bring any meat products into Japan, including gyoza, meat buns, sausages, and meatballs etc.
2. Do not send meat products to Japan by international mail or courier service.
Illegal importation of meat products and other livestock products into Japan may result in a fine of up to 3 million yen (up to 50 million yen for corporations) or imprisonment of up to three years.

👉　https://www.maff.go.jp/aqs/tetuzuki/product/aq2.html